Closest to the base&comma; the compact zinc steel alloy layer has a complex structure&comma; and strong corrosion resistance&period; It contains compounds of FeZn and FeZn13&comma; its hardness is 211DPN&comma; with an Fe content of 7&percnt;-11&percnt;&period;

The zinc sub layer

It is characterized by significant monoclinic columnar structure&comma; with an Fe content of 6&percnt;&period; The hardness is 179DPN&period;

The pure zinc layer

It is composed of dense-hexagonal crystal&comma; and deformation processing makes it not easy to break&period; With an zinc content of 98&period;5&percnt;&comma; its hardness is 70DPN&period;